She flaunted her figure in a black bikini and wore matching big dark sunglasses.

She pulled her newly dyed dark brown locks back off her face.

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They couldn't keep their hands off each other in the pool (Image: BACKGRID)

They put on a steamy display (Image: BACKGRID)

They enjoyed a Mexican getaway (Image: BACKGRID)

The Mexican getaway spot might look familiar and that's because it's the same part of Mexico where Kourtney enjoyed her 38th birthday with sister Kim and their friends last year.

Just after Christmas Scott finally went Instagram official with his new squeeze - but people thought she's looking more and more like his ex.

The Keeping Up With The Kardashians star has been dating the model for a few months now.

Sofia flaunted her amazing figure (Image: BACKGRID)

She looked incredible in her bikini (Image: BACKGRID)

They seem very close (Image: BACKGRID)

And while she's flooded her social media with pictures of him, he's only ever shared ones of her on his Instagram story, which disappears 24 hours later.

"I’m on a whole new year vibe," he wrote alongside the picture of them stood on a private jet.

Scott shared his first permanent pic of Sofia (Image: Instagram)

People think she looks like Kourtney with her brunette hair (Image: Instagram)

The couple, dressed in fur coats and sunglasses, cuddle into each other as they stand in the aisle of the plane.

But the main thing people took away from the image was that Sofia - daughter of Lionel Richie - looks strikingly similar to Kourtney now that she's got brunette hair.

One commented: "She's looking more and more like kourtney with every post."

While another said: "When you can’t marry a Kardashian, you try to clone one."

One of his followers wrote: "tell me though that she’s not trying to pull the Kourtney vibe, black hair etc"

"She resembles Kourtney K lol," said another, while one dubbed her a "Kourtney look alike"

Scott was with Kourtney for 10 years (Image: Splash News)

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Sofia shared a similar picture on her own Instagram page.

In hers, she stands facing Scott as he leans against the nose of the plane.

She captioned it: "Ready for 2018".

The comments about Kourtney continued, with one saying: "lol omg mini kourtney much?"

It comes after claims that Scott is worried his youngest son Reign isn't his biological child.

A source is claiming that the reality star is closer to his children Mason, seven, and Penelope, five, because he doesn't have the same bond with Reign, who turns three on December 14.

According to the insider, Scott has asked his ex - and the children's mother - Kourtney for a DNA test to prove Reign is his but she refused, strengthening Scott's suspicions.

He was first pictured with Sofia in October (Image: Flynet Pictures)

She's shared a lot of pictures of him (Image: Splash News)

Reign was just six months old when Scott and Kourtney broke up.

A source told In Touch Weekly : "Reign was conceived when Kourtney and Scott were going through a rough patch. At the time, Scott didn’t question whether he was the father, but that soon changed.

"It didn’t take long for Scott to start having doubts as to whether Reign is actually his child."

The insider claims Scott's suspicions become heightened every time someone comments on the kids' looks.

They say it "gets under Scott's skin" that Mason and Penelope look like him but Reign looks more like Kourtney.

The source said: "There were countless times when they'd split up and not see each other for weeks. And whenever they had a huge argument, Kourtney went out of her way to see revenge. She'd often party with pals and close guy friends."